Lime-kiln



2 Sheets-Sheet I.

A. 8. WEEKS.

Lime Kiln.

} No. 19525. Patented March 2, 1858.

u PETERS. Pmwunw n mr. Wahirmon. D. C.

ABNER B. WEEKS, OF ROOKLAND, MAINE.

LIME-KILN.

Specification of Letters Patent No. 19,525, dated March 2, 1858.

To all whom it may concern:

Be it known that I, ABNER B. YVEEKS, of Roekland, in the county of Lincoln and State of Maine, have invented an Improved Kiln for Burning Lime; and I do hereby declare that the same is fully described and represented in the following specification and the accompanying drawings, of which- Figure 1, denotes a side elevation of the said kiln; Fig. 2, a rear elevation of it; Fig. 3, a top View of it; Fig. 4, a horizontal section taken through. the fireplaces; Fig. 5, a horizontal section taken through the ash pits and showing the air passages leading into the same from the air passages below the hearths of the stacks; Fig. 6, is a longitudinal and vertical section taken through the two stacks; Fig. 7, is a transverse and vertical section taken through one of the stacks.

In the drawings, A, and, B, represent two stacks or barrels, as they are sometimes termed, they being arranged near together, and to the fire place or furnace, C, placed directly between the two and made to open into each by openings through its opposite sides as shown at, a, and, b, in Figs. 4-, and 7. Besides such fireplace, each of the stacks is provided with another arranged respectively as shown at, D, and, E. Under each fireplace, is an ash pit, F. The mouths of the said fire places and ash pits are furnished respectively with doors, as shown at e, e, e; f, f, f, in Figs. 1, 4, and 5. Both of these stacks A, B, open at top into one receiving hopper, G, and each stack is furnished with an inclined hearth, H, whose upper surface is at an inclination of about 45, and slopes toward the discharglng mouth or door 9, of the stack. This bottom or hearth may be formed of a plate of castiron having a flat upper surface such plate being made to rest over a series of parallel air passages/z, h, 71, leading into one common passage 2', (see Figs. 5, 6, and 7,) made to open into the adjacent ash pits of the furnaces on opposite sides of the stack. In consequence of this arrangement of air passages with respect to the hearth the air for the supply of the ash pit and fuel may be caused to pass underneath the hearth before it enters the ash pits and passes through the fuel, the result being that not only will the calcined lime on the hearth be cooled down but the air will be heated by heat radiated from the hearth, and as a matter of course will facilitate the combustion of the fuel, and thus economize the working of the kiln. Furthermore, the inclined hearth. facilitates removal of the calcined lime from the stack. Each stackis to be furnished with poke holes c", 2", the form of the stack not differing materially from others in common use.

The advantage of my arrangement and combination of three fire places and two stacks is of great economy in working both stacks, as whenever, the charge of either, may have become sufliciently roasted, we can turn all the heat of the middle fire place, and thus save so much heat, while we may be discharging from the other stack, the roasted lime. In order to cause the heat of the central fireplace to pass entirely into either stack, we have only to suffer the fire that may be in the lateral fire place, of the other stack to go down. The increased draft of the first stack, will cause all the heat of the middle furnace to be drawn into it. Furthermore, the employment of one hopper with two stacks opening directly into it is advantageous, as it enables a larger mass of lime stone to be heated, than when a separate hopper for each stack is used, and besides this, it enables the large hopper to be used for either stack, while the other is having any of its contents with drawn. It is advantageous in other respects. The fiat hearth with air passages under it, has an advantage over an air pipe or conductor placed in the kiln and on, or just above the top surface of the-hearth, for this latter tends to clog the lime and obstruct its withdrawal from the kiln, whereas my arrangement presents no obstruction to the removal of the lime from the kiln.

I do not claim any of the devices shown in the patent of Aaron J effries, dated April 21st, 1857; nor any of those shown in the patent of Isaac Richardson dated Feby. 21, 1840; nor do I claim a single stack having at its top a single mouth of discharge and at its bottom or lower part a wall to extend above such bottom about one third the height of the stack, the same being as shown in I-Ieberts Cyclopedia vol. 2, page 16, but

1. I claim my improved arrangement of a single hopper with respect to two separate stacks such being placed at or over their upper ends and so as to flare and increase in width from them upward and communicate With them as represented in the accompanying drawings, and as above described.

2. I also claim arranging air or cooling passages horizontally or with the inclinations as described under broad flat hearths of any suitable material in the manner and for the purpose as set forth, and in combination and connection With the furnace of a lime kiln by means of pipes or passages constructed and relatively arranged as 10 specified.

In testimony whereof I have hereunto set my signature.

ABNER B. WEEKS. 

